"Balsas and Avons are the 'boss' floats on running water whenever conditions demand the use of weight down the line."
Like Stick Floats, you use Balsa Floats and Avon Floats exclusively for 'trotting' running water; their buoyancy is
concentrated towards the top and you attach them to your line top-and-bottom
with Float Rubbers. But there the similarity ends.
Though Balsa Floats are indeed usually made of thickish lengths of balsa wood, some manufacturers have brought out polystyrene and hollow plastic versions. Whatever the material, all have fat, buoyant tops that allow them to ride very fast and often turbulent water without being constantly dragged under the surface.
Bunch most of the shot (SSGs, AAAs, BBS) below
halfway between float and hook.
Avon Floats have slim stems below bulbous bodies, and long, slim tops. Traditionally made from cane and balsa, they are now also available with polystyrene or hollow plastic bodies and wire or plastic stems.
Their long, slim tops, meanwhile, give a degree of sensitivity and allow you to see them clearly right to the end of a very long trot.
A variant of the standard Avon Float is the Balsa and Crow Quill Avon Float.
It's the ideal float in swims where you
would usually fish a Stick Float but where there
are masses of small, nuisance fish near the surface and in mid-water. The bulk
shot takes the bait straight down to the better fish near the bottom, but no
sensitivity of bite registration is lost.
Use the same basic shotting pattern for both standard and 'Topper' Avon Floats.